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Thereof, where do we find comets?

Comets orbit the sun, but most are believed to inhabit in an area known as the Oort Cloud, far beyond the orbit of Pluto. Occasionally a comet streaks through the inner solar system; some do so regularly, some only once every few centuries.

how many comets are there? As of July 2019 there are 6,619 known comets, a number that is steadily increasing as they are discovered. However, this represents only a tiny fraction of the total potential comet population, as the reservoir of comet-like bodies in the outer Solar System (in the Oort cloud) is estimated to be one trillion.

Beside above, how do comets move?

Comets go around the Sun in a highly elliptical orbit. They can spend hundreds and thousands of years out in the depths of the solar system before they return to Sun at their perihelion. Like all orbiting bodies, comets follow Kepler's Laws - the closer they are to the Sun, the faster they move.

How do comets die?

Once a comet has outgassed all the available volatile, its coma and tail will disappear and the remaining inert nucleus will take on the appearance of a low albedo asteroid. After 500 times or so a comet passes near the Sun, most of its ice and gas is lost, leaving a rocky object.